由试验模态数据检测结构破损的位置和大小

Detection of Location and Magnitude of Structural Damage Using Measured Model Data

提出了一种用有噪声影响的不完整振型和频率来检测结构破损的方法。先由局部频率变化率的概念诊断出结构的破损位置，然后用灵敏度分析法确定破损的大小。整个过程分测试振型的扩充、结构破损的定位和破损大小的确定三部分。文中用GARTEUR结构对多种破坏情况进行了仿真研究。结果表明，该方法能简便有效地同时诊断结构中的单个或多个破坏情况。

A new method is proposed to detect the location and magnitude of damages in a structure by using incomplete and noisy measured modal data. The complete procedure consists of three parts:expansion of the measured mode shapes; localization of the damage domain using a concept of Local Frequency Change Ratio; damage quantification by a iterative process. For illustrating the effectiveness of this method, several damage cases in the GARTEUR structure are investigated. Results illustrate that the presented approach can simply and to effec tively locate and quantify damages in the structure.